This Old House

For easy-care exteriors

All-weather trim

Duration crown molding

This 9-inch-wide molding is milled from TruExterior poly-ash, a material impervious to water and barely affected by temperature swings. It’s also approved for use in areas prone to wildfires. Cuts smoothly with ordinary carbide saw blades, and you can fasten it with 15- or 16-gauge nails as close as 1⁄8 inch from an edge without it splitting or crumbling. $19 per linear foot; durationmillwork.com

WHAT IS POLY-ASH?

This amalgam of adhesive polymers and fly ash recovered from coalburning power plants is marketed under the name TruExterior. Its uniformity allows it to be milled into paint-grade exterior products, such as siding, molding, and trim, and its dimensional stability

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